EP2218531A1 - Clamping device for machine tools - Google Patents

Clamping device for machine tools Download PDF

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Publication number
EP2218531A1
EP2218531A1 EP09001874A EP09001874A EP2218531A1 EP 2218531 A1 EP2218531 A1 EP 2218531A1 EP 09001874 A EP09001874 A EP 09001874A EP 09001874 A EP09001874 A EP 09001874A EP 2218531 A1 EP2218531 A1 EP 2218531A1
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EP
European Patent Office
Prior art keywords
gear
clamping device
train
drive
servomotor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09001874A
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German (de)
French (fr)
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EP2218531A9 (en
EP2218531B1 (en
Inventor
Karl Hiestand
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Individual
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Individual
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Priority to EP09001874A priority Critical patent/EP2218531B1/en
Priority to JP2010018444A priority patent/JP2010184345A/en
Priority to US12/658,335 priority patent/US20100283215A1/en
Publication of EP2218531A1 publication Critical patent/EP2218531A1/en
Publication of EP2218531A9 publication Critical patent/EP2218531A9/en
Application granted granted Critical
Publication of EP2218531B1 publication Critical patent/EP2218531B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/16—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving radially
    • B23B31/16195—Jaws movement actuated by levers moved by a coaxial control rod
    • B23B31/16229—Jaws movement actuated by levers moved by a coaxial control rod using mechanical transmission through the spindle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/24—Chucks characterised by features relating primarily to remote control of the gripping means
    • B23B31/28—Chucks characterised by features relating primarily to remote control of the gripping means using electric or magnetic means in the chuck
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/20—Chucks or sockets with safety feature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/27—Separate chuck-actuating power source

Definitions

  • the invention relates to a clamping device for machine tools, which are provided with a power-operated chuck for holding a workpiece and whose clamping jaws are actuated by means of the clamping device via an axially adjustable drawbar, wherein the clamping device comprises a reversible servomotor, arranged between this and the drawbar drive train and a bell rotatably mounted with the servomotor, preferably rotatably mounted on a hollow shaft connected to the machine spindle.
  • the servomotor is coupled in this embodiment via a toothed belt drive with a drive wheel of a harmonic drive transmission, which is connected via a threaded roller drive with the pull rod driven. Due to the harmonic drive transmission, the small torque to be generated by the servo motor is converted at high speeds due to the transmission into low speeds and high torque.
  • the object of the invention is therefore to form a clamping device for machine tools of the aforementioned type in such a way that the stator of the servo motor can be arranged stationary and that its rotor is stopped at a clamped workpiece, rotating masses are therefore not given, the required torque for the but the axial force to be exerted by the pull rod is permanently present.
  • the servo motor should maintain constant the selected clamping force even in case of failure of the electrical energy, so that the clamping device is automatically secured. To accomplish this, no complex speed and direction control is required. Despite low construction costs should always be guaranteed high reliability.
  • a clamping device for machine tools of the type mentioned above in that the drive train is designed as a two-part gear train, the first part is arranged in a housing which is fixedly connected to the rotor shaft of the servomotor, that the input member and the Output member of the first gear train via the second gear train to the bell or to the machine spindle are connected, and that for axial displacement of the tie rod by means of the first gear train of the drive train during rotation of the housing relative rotation relative to the input directions of rotation between the input member and the output member can be generated.
  • the servo motor can be designed as an electric motor, preferably as a brake armature motor, or as a hydraulic motor u. its standstill torque should act directly on the housing of the 1st gear train.
  • the bell should be coupled via a gearbox or a Rollenxxlztrieb directly or via intermediate links with the tie rod, wherein the bell should be connected via a reduction gear to the output member of the second gear train to generate high clamping forces.
  • clamping device with a safety device by means of which the drive train is automatically locked.
  • the safety device may in this case be formed on one of two relatively rotatable components of the clamping device, held against the force of a spring held by an electromagnet locking pins which automatically engages in failure of the electrical energy provided in a recess provided on the other component recess.
  • the clamping device should be designed with a safety control, by means of which the strength of individual or all components of the clamping device, in particular the gear trains, can be checked by short-term overloading at intervals that can be selected at intervals.
  • a clamping device for machine tools according to the invention it is possible to produce the axial adjustment movements of the pull rod required for opening and closing the chuck by slight rotations of the servo motor and of the first gear train or of the housing accommodating them and in a simple manner via the second Gear train to transfer directly or via other gear members on the drawbar. By the under or translation of the first gear train, the relative rotation is accomplished.
  • the servomotor of the clamping device in particular if this is designed as a brake armature motor, is a safety device by which the tension force is automatically maintained in case of failure of the electrical energy, but it can also be provided a safety device for locking the drive train.
  • the clamping device can be equipped with a safety control in order to check at timely intervals the components of the clamping device by overloading in a simple manner. It is therefore an electric tensioner created by the servo motor, the clamping force is selectable and secure and only slightly rotates in each case during opening and closing of the chuck in one direction of rotation. A high level of operational safety and a long service life are therefore always guaranteed.
  • the in the FIGS. 1 and 2 illustrated and designated 1 clamping device is used to actuate a power tool chuck 3 arranged on a machine tool 2, by means of the radially adjustable clamping jaws 4, a workpiece 10 to be machined in the power chuck 3 can be clamped.
  • the clamping jaws 4 of the power chuck 3 are in this case actuated via lever 7 by an axially movable tie rod 6, which is in drive connection with a reversible electric servomotor 11 via a drive train 31 and a bell 22.
  • the bell 22 is rotatably supported in this embodiment by means of bearings 23 and 24 on a hollow shaft 21 which is fixedly connected by screw 9 with a driven by an electric motor 8 machine spindle 5.
  • the servo motor 11 of the clamping device 11.1 is in the embodiment of the Fig. 1 and 2 designed as a brake rotor motor whose starter 12 is fixedly arranged in a housing 15 which is held by means of screws 20 on a headstock 16 of the machine tool 2.
  • the rotor 13 of the servomotor 11, in contrast, is provided with a rotor shaft 14, on which a housing 34 is non-rotatably mounted via a wedge 35.
  • the rotor 13 is further equipped with a brake disc 18 and a compression spring 19 which cooperate with a mounted on the housing 15 clutch plate 17.
  • the provided between the servomotor 11 and the bell 22 drive train 31 is formed as a two-part gear train 32 and 33, the first part 32 is installed in a housing 34 which is connected via a wedge 35 fixed to the rotor shaft 14 of the servo motor 11.
  • the driving energy of the servomotor 11 can thus be transmitted to the housing 34 and via this to the first gear train 32.
  • the first gear train has a trained as a shaft input member 36 which is connected to a driven on the hollow shaft 21 arranged output member 42 via a translation stage 44 of the second gear train 33 with this drive.
  • the output member 37 of the first gear train 32 is coupled via a translation stage 43 with an attached to the bell 22 input member 41 and with this.
  • the first gear 32 of the drive member 31 is thereby driven by the machine spindle 5; also can be influenced via this the pull rod 6.
  • the two gear stages 39 and 40 of the first gear train 32 are formed by toothed belt drives, the central pulleys are rotatably mounted on the input member 36 and the output member 37.
  • the respectively associated toothed belt pulleys are rotatably mounted on a shaft 38, which is supported in the housing 34. If the housing 34 is driven by the rotor shaft 14 of the servo motor 11, the shaft 38 is rotated about the input member 36, and it is generated in the first gear 32, a relative rotation of the first gear stage 39 relative to the second gear stage 40 depending on the chosen translation.
  • Both the gear ratios 39 and 40 of the first gear train 32, as well as the gear ratios 42 and 43 of the second gear train 33, as shown in the Fig. 1 and 2 is shown, designed as a toothed belt drives or as V-belt drives. But it is also possible to interpret these gear ratios as gear stages. Also, the translations depending on the application of the clamping device 1 can be selected.
  • FIG. 1 shows the clamping device 1 before the start of a clamping operation, ie the chuck 3 is open, the servo motor 11 is de-energized, so that the clutch disc 17 rests against the brake disc 18 and all components are stopped.
  • Fig. 2 is clamped between the clamping jaws 4 of the power chuck 3, a workpiece 10.
  • the clamping jaws 4 are to be moved radially inwards.
  • the pull rod 6, which is in driving connection via an intermediate member 6 'with the reversing levers 7, to move to the right.
  • the servomotor 11 is to supply voltage controlled electrical energy.
  • the connected to the rotor shaft 14 housing 15 is thereby rotated so that a speed difference between the input member 36 and the output member 32 is formed by the translation stages 39 and 40 of the first gear train 32 or the second gear train 33, depending on the design.
  • the differential speed with respect to the hollow shaft 21 is directed to the bell 22.
  • the pull rod 6 is thus displaced axially to the right.
  • the servo motor 11 is to be reversed, so that the pull rod 6 is moved to the left.
  • a corresponding torque of the servomotor 11 is to be initiated in the operating position, which is to be selected depending on the required clamping force. Since this moment can be changed easily by means of a voltage regulator, the clamping force of the chuck 2 is also easily adapted to the particular application. Also, the two gear trains 32 and 33 of the drive train 31 can be mutually interpreted as a reduction or as a transmission gear.
  • Fig. 4 is the bell 22 'a reduction gear 27 upstream, so that in a relative rotation between the hollow shaft 21' and the tie rod 6, this is only slightly adjusted and therefore particularly high clamping forces are to be generated.
  • the reduction gear 27 designed as a planetary gear drive is in this case connected to the machine spindle 5 and the input member 41 of the second gear stage, in addition to the hollow shaft 22 '.
  • the tensioning device 1 ' is additionally equipped with a safety device 51 and a safety control 61. Furthermore, as a servomotor 11 ', a commercially available electric motor is provided and its rotor shaft 14' is connected via a toothed belt drive 14 "with the housing of the first gear train 32, which consists of gear stages, drivingly connected.
  • a servomotor 11 ' a commercially available electric motor is provided and its rotor shaft 14' is connected via a toothed belt drive 14 "with the housing of the first gear train 32, which consists of gear stages, drivingly connected.
  • the safety device 51 consists in this case of a safety pin 52 which is inserted in a connected to the input member 41 of the second gear train intermediate piece 56, a spring 53 and an electromagnet 54.
  • a safety pin 52 which is inserted in a connected to the input member 41 of the second gear train intermediate piece 56, a spring 53 and an electromagnet 54.
  • the magnetic force of the safety pin 52 engages by the force of the spring 53 in automatically a recess 55, which is incorporated in a further on the hollow shaft 21 'fixed member 57. In this way, the clamping device 1 'is blocked, so that even in case of power failure, the clamping force is maintained.
  • the strength of individual or all components of the clamping device 1, in particular the components of the gear trains 32 and 33, can be checked at selectable intervals, in which they are overstressed for a short time. A high level of operational reliability is thus guaranteed.

Abstract

The device (1) has a drive train (31) formed as two gear trains (32, 33), which are alternately designed as a reduction gear or a step-up gear. One of the gear trains is arranged in a housing (34) fixedly connected to a rotor shaft (14). Input and output elements (36, 37) of the gear train are connected to a cover (22) or a machine spindle (5). Relative rotations are produced opposite to input rotation directions between the elements by the former gear train during rotations of the housing for axial adjustment of an axially movable connecting rod (6).

Description

Die Erfindung bezieht sich auf eine Spanneinrichtung für Werkzeugmaschinen, die mit einem kraftbetätigten Spannfutter zur Halterung eines Werkstückes versehen und dessen Spannbacken mittels der Spanneinrichtung über eine axial verstellbare Zugstange betätigbar sind, wobei die Spanneinrichtung einen umschaltbaren Stellmotor, einem zwischen diesem und der Zugstange angeordneten Antriebsstrang sowie eine trieblich mit dem Stellmotor gekoppelte, vorzugsweise auf einer mit der Maschinenspindel verbundenen Hohlwelle drehbar gelagerte Glocke aufweist.The invention relates to a clamping device for machine tools, which are provided with a power-operated chuck for holding a workpiece and whose clamping jaws are actuated by means of the clamping device via an axially adjustable drawbar, wherein the clamping device comprises a reversible servomotor, arranged between this and the drawbar drive train and a bell rotatably mounted with the servomotor, preferably rotatably mounted on a hollow shaft connected to the machine spindle.

Durch die DE 10 2006 050 918 A1 ist ein Elektrospanner dieser Art bekannt. Der Stellmotor ist bei dieser Ausgestaltung über einen Zahnriementrieb mit einem Antriebsrad eines Harmonik-Drive-Getriebes gekoppelt, das über einen Gewinderolltrieb mit der Zugstange trieblich verbunden ist. Durch das Harmonik-Drive -Getriebe wird hierbei das von dem Stellmotor zu erzeugende kleine Drehmoment bei hohen Drehzahlen aufgrund der Übersetzung in niedere Drehzahlen und ein hohes Drehmoment umgewandelt.By the DE 10 2006 050 918 A1 An electric clamp of this type is known. The servomotor is coupled in this embodiment via a toothed belt drive with a drive wheel of a harmonic drive transmission, which is connected via a threaded roller drive with the pull rod driven. Due to the harmonic drive transmission, the small torque to be generated by the servo motor is converted at high speeds due to the transmission into low speeds and high torque.

Abgesehen von dem erheblichen, durch das Harmonik-Drive-Getriebe bedingten Bauaufwand ist es notwendig, während eines Arbeitsvorganges, veranlasst durch die unmittelbare Koppelung des Antriebsrades des Harmonik-Drive-Getriebes mit dem Stellmotor, dass dieser stets eine konforme Drehrichtung und auch eine exakte Drehzahl in bezug auf die Maschinenspindel aufweist, um eine konstante Zug- bzw. Druckkraft über die Zugstange auf die Spannbacken ausüben zu können. Dies wiederum bedingt eine externe und sehr aufwendige elektronische Maschinensteuerung und -überwachung. Bei einer Rechtsdrehung der Maschinenspindel muss nämlich der Stellmotor etwas schneller als diese umlaufen. Bei einer Linksdrehung dagegen etwas langsamer, um das entsprechende Drehmoment auf das Antriebsrad des Harmonik-Drive-Getriebes zu übertragen. Diese Anforderungen, auch hinsichtlich der Wartung, sind sehr kostenintensiv, auch ist die Inbetriebnahme und die Montage der bekannten Spanneinrichtung sehr aufwendig. Des Weiteren ist von Nachteil, dass bei einer sekundenschnellen Drehrichtungsumkehrung das Trägheitsmoment des Stellmotors bei Aufrechterhaltung des Drehmomentes nur sehr schwierig zu beherrschen ist. Ferner ist beim Versagen der Steuerung oder bei einem Stromausfall eine Betriebssicherung nicht gegeben, so dass der Einsatzbereich dieser Spanneinrichtung sehr begrenzt ist.Apart from the considerable, due to the harmonic drive gear construction effort, it is necessary, during a work procedure, caused by the immediate coupling of the drive wheel of the harmonic drive transmission with the actuator, that this always a conforming direction and an exact speed with respect to the machine spindle, in order to exert a constant tensile or compressive force on the tie rod on the clamping jaws can. This again requires an external and very complex electronic machine control and monitoring. In the case of a clockwise rotation of the machine spindle, the servomotor has to rotate a little faster than this. On the other hand, when turning to the left, it is a bit slower to transmit the corresponding torque to the drive wheel of the Harmonic Drive transmission. These requirements, also in terms of maintenance, are very costly, and the commissioning and installation of the known clamping device is very expensive. Furthermore, it is disadvantageous that in the case of reversing the direction of rotation within seconds, the moment of inertia of the servomotor is very difficult to control while maintaining the torque. Furthermore, in case of failure of the controller or in the event of a power failure, there is no operational safety, so that the field of application of this clamping device is very limited.

Aufgabe der Erfindung ist es daher, eine Spanneinrichtung für Werkzeugmaschinen der vorgenannten Gattung in der Weise auszubilden, dass der Stator des Stellmotors ortsfest angeordnet werden kann und dass dessen Rotor bei einem eingespannten Werkstück stillgesetzt ist, Drehmassen demnach nicht gegeben sind, das erforderliche Drehmoment für das die von der Zugstange auszuübende Axialkraft aber permanent ansteht. Außerdem soll der Stellmotor die gewählte Spannkraft auch bei Ausfall der elektrischen Energie konstant aufrecht erhalten, so dass die Spanneinrichtung selbsttätig gesichert ist. Um dies zu bewerkstelligen soll keine aufwendige Drehzahl- und Drehrichtungssteuerung benötigt werden. Trotz geringem Bauaufwand soll dennoch stets eine hohe Betriebssicherheit gewährleistet sein.The object of the invention is therefore to form a clamping device for machine tools of the aforementioned type in such a way that the stator of the servo motor can be arranged stationary and that its rotor is stopped at a clamped workpiece, rotating masses are therefore not given, the required torque for the but the axial force to be exerted by the pull rod is permanently present. In addition, the servo motor should maintain constant the selected clamping force even in case of failure of the electrical energy, so that the clamping device is automatically secured. To accomplish this, no complex speed and direction control is required. Despite low construction costs should always be guaranteed high reliability.

Gemäß der Erfindung wird dies bei einer Spanneinrichtung für Werkzeugmaschinen der eingangs genannten Art dadurch erreicht, dass der Antriebsstrang als zweiteiliger Getriebezug ausgebildet ist, dessen erster Teil in einem Gehäuse angeordnet ist, das fest mit der Rotorwelle des Stellmotors verbunden ist, dass das Eingangsglied und das Ausgangsglied des ersten Getriebezuges über den zweiten Getriebezug an die Glocke bzw. an die Maschinenspindel angeschlossen sind, und dass zur axialen Verstellung der Zugstange mittels des ersten Getriebezuges des Antriebsstranges bei Verdrehungen des Gehäuses Relativdrehungen gegenüber den Eingangsdrehrichtungen zwischen dem Eingangsglied und dem Ausgangsglied erzeugbar sind.According to the invention, this is achieved in a clamping device for machine tools of the type mentioned above in that the drive train is designed as a two-part gear train, the first part is arranged in a housing which is fixedly connected to the rotor shaft of the servomotor, that the input member and the Output member of the first gear train via the second gear train to the bell or to the machine spindle are connected, and that for axial displacement of the tie rod by means of the first gear train of the drive train during rotation of the housing relative rotation relative to the input directions of rotation between the input member and the output member can be generated.

Sehr zweckmäßig ist es hierbei, die beiden Getriebezüge des Antriebsstranges wechselseitig als Untersetzungsgetriebe bzw. als Übersetzungsgetriebe auszulegen und die Übersetzungsstufen der beiden Getriebezüge des Antriebsstranges durch einen Zahnriementrieb, einen Keilriementrieb oder durch Zahnradstufen zu bilden.It is very expedient here to interpret the two gear trains of the drive train mutually as a reduction gear or as a transmission gear and to form the gear ratios of the two gear trains of the drive train by a toothed belt drive, a V-belt drive or by gear stages.

Der Stellmotor kann als Elektromotor, vorzugsweise als Bremsankermotor, oder als Hydraulikmotor ausgebildet sein u. dessen Stillstandsdrehmoment sollte unmittelbar auf das Gehäuse des 1. Getriebezuges einwirken. Außerdem sollte die Glocke über einen Getriebetrieb oder einen Rollenwälztrieb unmittelbar oder über Zwischenglieder mit der Zugstange gekoppelt sein, wobei zur Erzeugung hoher Spannkräfte die Glocke über ein Untersetzungsgetriebe mit dem Abtriebsglied des zweiten Getriebezuges trieblich verbunden sein sollte.The servo motor can be designed as an electric motor, preferably as a brake armature motor, or as a hydraulic motor u. its standstill torque should act directly on the housing of the 1st gear train. In addition, the bell should be coupled via a gearbox or a Rollenwälztrieb directly or via intermediate links with the tie rod, wherein the bell should be connected via a reduction gear to the output member of the second gear train to generate high clamping forces.

Vorteilhaft ist es ferner, die Spanneinrichtung mit einer Sicherheitseinrichtung zu versehen, mittels der der Antriebsstrang selbsttätig verriegelbar ist.It is also advantageous to provide the clamping device with a safety device by means of which the drive train is automatically locked.

Die Sicherheitseinrichtung kann hierbei aus an einem von zwei relativ zueinander verdrehbaren Bauteilen der Spanneinrichtung angeordneten, entgegen der Kraft einer Feder durch einen Elektromagneten gehaltenen Sicherungsbolzen gebildet sein, der bei Ausfall der elektrischen Energie in eine an dem anderen Bauteil vorgesehene Ausnehmung selbsttätig einrastet.The safety device may in this case be formed on one of two relatively rotatable components of the clamping device, held against the force of a spring held by an electromagnet locking pins which automatically engages in failure of the electrical energy provided in a recess provided on the other component recess.

Des Weiteren sollte die Spanneinrichtung mit einer Sicherungssteuerung ausgestaltet werden, mittels der in zeitlich wählbaren Abständen die Festigkeit einzelner oder aller Bauteile der Spanneinrichtung, insbesondere der Getriebezüge, durch kurzzeitige Überlastung überprüfbar ist.Furthermore, the clamping device should be designed with a safety control, by means of which the strength of individual or all components of the clamping device, in particular the gear trains, can be checked by short-term overloading at intervals that can be selected at intervals.

Wird eine Spanneinrichtung für Werkzeugmaschinen gemäß der Erfindung ausgebildet, so ist es möglich, die zum Öffnen und Schließen des Spannfutters erforderlichen axialen Verstellbewegungen der Zugstange durch geringfügige Verdrehungen des Stellmotors und des ersten Getriebezuges bzw. des diesen aufnehmenden Gehäuse zu erzeugen und auf einfache Weise über den zweiten Getriebezug, unmittelbar oder über weitere Getriebeglieder auf die Zugstange zu übertragen. Durch die Unter- oder Übersetzung des ersten Getriebezuges wird die Relativverdrehung bewerkstelligt.If a clamping device for machine tools according to the invention is formed, it is possible to produce the axial adjustment movements of the pull rod required for opening and closing the chuck by slight rotations of the servo motor and of the first gear train or of the housing accommodating them and in a simple manner via the second Gear train to transfer directly or via other gear members on the drawbar. By the under or translation of the first gear train, the relative rotation is accomplished.

Des Weiteren ist von großem Vorteil, dass bei einem eingespannten Werkstück ein Stillstandsdrehmoment des Stellmotors, das je nach der gewünschten bzw. erforderlichen Spannkraft einstellbar und über den zweiten Getriebezug übertragbar ist, auf das Spannfutter einwirkt. Ein vielseitiger Einsatz der vorschlagsgemäß ausgebildeten Spanneinrichtung ist demnach, trotz des geringen Bauaufwandes, gegeben.Furthermore, it is of great advantage that with a clamped workpiece, a standstill torque of the servo motor, which is adjustable depending on the desired or required clamping force and transferable via the second gear train, acts on the chuck. A versatile use of the proposed trained clamping device is therefore, despite the low construction costs, given.

Der Stellmotor der Spanneinrichtung, insbesondere wenn dieser als Bremsankermotor ausgebildet ist, stellt eine Sicherheitseinrichtung dar, durch die bei Ausfall der elektrischen Energie die Spannkraft selbsttätig aufrecht erhalten bleibt, es kann aber zusätzlich eine Sicherheitseinrichtung zur Verriegelung des Antriebsstranges vorgesehen werden. Auch kann die Spanneinrichtung mit einer Sicherheitssteuerung ausgestattet werden, um in zeitlich wählbaren Abständen die Bauteile der Spanneinrichtung durch Überlastung auf einfache Weise überprüfen zu können. Es ist demnach ein Elektrospanner geschaffen, mittels dessen Stellmotor die Spannkraft wählbar und zu sichern ist und der nur beim Öffnen und Schließen des Spannfutters geringfügig in jeweils einer Drehrichtung kurzzeitig umläuft. Eine hohe Betriebssicherheit und eine lange Lebensdauer sind demnach stets gewährleistet.The servomotor of the clamping device, in particular if this is designed as a brake armature motor, is a safety device by which the tension force is automatically maintained in case of failure of the electrical energy, but it can also be provided a safety device for locking the drive train. Also, the clamping device can be equipped with a safety control in order to check at timely intervals the components of the clamping device by overloading in a simple manner. It is therefore an electric tensioner created by the servo motor, the clamping force is selectable and secure and only slightly rotates in each case during opening and closing of the chuck in one direction of rotation. A high level of operational safety and a long service life are therefore always guaranteed.

In der Zeichnung sind ein Ausführungsbeispiel sowie Ausführungsvarianten der gemäß der Erfindung ausgebildeten Spanneinrichtung dargestellt und nachfolgend im Einzelnen erläutert. Hierbei zeigen:

Figur 1
die Spanneinrichtung im Ruhezustand, in einem Axialschnitt,
Figur 2
die Spanneinrichtung nach Figur 1 mit einem eingespannten Werkstück,
Figur 3
einen Schnitt nach der Linie III-III der Figur 2,
Figur 4
die Spanneinrichtung nach Figur 1 mit einem zusätzlichen Untersetzungsgetriebe,
Figur 5
einen Schnitt nach der Linie V-V der Figur 4 und
Figur 6
die Spanneinrichtung nach Figur 4 mit andersartiger Ausgestaltung einzelner Bauteile und zusätzlicher Sicherheitseinrichtungen.
In the drawing, an embodiment and variants of the embodiment formed according to the invention clamping device are shown and explained in detail below. Hereby show:
FIG. 1
the tensioning device at rest, in an axial section,
FIG. 2
the clamping device after FIG. 1 with a clamped workpiece,
FIG. 3
a section along the line III-III of FIG. 2 .
FIG. 4
the clamping device after FIG. 1 with an additional reduction gear,
FIG. 5
a section along the line VV the FIG. 4 and
FIG. 6
the clamping device after FIG. 4 with different design of individual components and additional safety devices.

Die in den Figuren 1 und 2 dargestellte und mit 1 bezeichnete Spanneinrichtung dient zur Betätigung eines auf einer Werkzeugmaschine 2 angeordneten Kraftspannfutters 3, mittels dessen radial verstellbarer Spannbacken 4 ein zu bearbeitendes Werkstück 10 in dem Kraftspannfutter 3 einspannbar ist. Die Spannbacken 4 des Kraftspannfutters 3 sind hierbei über Umlenkhebel 7 durch eine axial bewegbare Zugstange 6 betätigbar, die mit einem umschaltbaren elektrischen Stellmotor 11 über einen Antriebsstrang 31 und eine Glocke 22 in Triebverbindung steht. Die Glocke 22 ist bei dieser Ausgestaltung mittels Wälzlager 23 und 24 drehbar auf einer Hohlwelle 21 gelagert, die durch Schraube 9 fest mit einer durch einen Elektromotor 8 antreibbaren Maschinenspindel 5 verbunden ist.The in the FIGS. 1 and 2 illustrated and designated 1 clamping device is used to actuate a power tool chuck 3 arranged on a machine tool 2, by means of the radially adjustable clamping jaws 4, a workpiece 10 to be machined in the power chuck 3 can be clamped. The clamping jaws 4 of the power chuck 3 are in this case actuated via lever 7 by an axially movable tie rod 6, which is in drive connection with a reversible electric servomotor 11 via a drive train 31 and a bell 22. The bell 22 is rotatably supported in this embodiment by means of bearings 23 and 24 on a hollow shaft 21 which is fixedly connected by screw 9 with a driven by an electric motor 8 machine spindle 5.

Der Stellmotor 11 der Spanneinrichtung 11.1 ist bei dem Ausführungsbeispiel nach den Fig. 1 und 2 als Bremsankermotor ausgebildet, dessen Starter 12 fest in einem Gehäuse 15 angeordnet ist, das mittels Schrauben 20 an einem Spindelstock 16 der Werkzeugmaschine 2 gehalten ist. Der Rotor 13 des Stellmotors 11 ist dagegen mit einer Rotorwelle14 versehen, auf der über einen Keil 35 drehfest ein Gehäuse 34 aufgesetzt ist. Der Rotor 13 ist des Weiteren mit einer Bremsscheibe 18 sowie einer Druckfeder 19 ausgestattet, die mit einer an dem Gehäuse 15 angebrachten Kupplungsscheibe 17 zusammenwirken. Bei Ausfall der Zufuhr von elektrischer Energie zu dem Stellmotor 11 wird durch die Kraft der Feder 19 sofort der Rotor 13 mit der Bremsscheibe 18 gegen die über das Gehäuse 15 mit dem ortsfesten Spindelstock 16 verbundenen Kupplungsscheibe 19 gedrückt, so dass die Rotorwelle 14 blockiert ist.The servo motor 11 of the clamping device 11.1 is in the embodiment of the Fig. 1 and 2 designed as a brake rotor motor whose starter 12 is fixedly arranged in a housing 15 which is held by means of screws 20 on a headstock 16 of the machine tool 2. The rotor 13 of the servomotor 11, in contrast, is provided with a rotor shaft 14, on which a housing 34 is non-rotatably mounted via a wedge 35. The rotor 13 is further equipped with a brake disc 18 and a compression spring 19 which cooperate with a mounted on the housing 15 clutch plate 17. In case of failure of the supply of electrical energy to the servomotor 11 is immediately pressed by the force of the spring 19, the rotor 13 with the brake disc 18 against the connected via the housing 15 with the stationary headstock 16 clutch disc 19, so that the rotor shaft 14 is blocked.

Der zwischen dem Stellmotor 11 und der Glocke 22 vorgesehene Antriebsstrang 31 ist als zweiteiliger Getriebezug 32 und 33 ausgebildet, dessen erster Teil 32 in einem Gehäuse 34 eingebaut ist, das über einen Keil 35 fest mit der Rotorwelle 14 des Stellmotors 11 verbunden ist. Die Antriebsenergie des Stellmotors 11 kann somit auf das Gehäuse 34 und über dieses auf den ersten Getriebezug 32 übertragen werden.The provided between the servomotor 11 and the bell 22 drive train 31 is formed as a two-part gear train 32 and 33, the first part 32 is installed in a housing 34 which is connected via a wedge 35 fixed to the rotor shaft 14 of the servo motor 11. The driving energy of the servomotor 11 can thus be transmitted to the housing 34 and via this to the first gear train 32.

Der erste Getriebezug weist ein als Welle ausgebildetes Eingangsglied 36 auf, das mit einem auf der angetriebenen Hohlwelle 21 angeordneten Ausgangsglied 42 über eine Übersetzungsstufe 44 des zweiten Getriebezuges 33 mit dieser trieblich verbunden ist. Das Ausgangsglied 37 des ersten Getriebezuges 32 ist dagegen über eine Übersetzungsstufe 43 mit einem auf der Glocke 22 angebrachten Eingangsglied 41 und mit dieser gekoppelt. Der erste Getriebezug 32 des Antriebsgliedes 31 ist dadurch durch die Maschinenspindel 5 antreibbar; auch kann über diesen die Zugstange 6 beeinflusst werden.The first gear train has a trained as a shaft input member 36 which is connected to a driven on the hollow shaft 21 arranged output member 42 via a translation stage 44 of the second gear train 33 with this drive. The output member 37 of the first gear train 32, however, is coupled via a translation stage 43 with an attached to the bell 22 input member 41 and with this. The first gear 32 of the drive member 31 is thereby driven by the machine spindle 5; also can be influenced via this the pull rod 6.

Die beiden Übersetzungsstufen 39 und 40 des ersten Getriebezuges 32 sind durch Zahnriementriebe gebildet, deren zentrale Zahnriemenscheiben auf dem Eingangsglied 36 bzw. dem Ausgangsglied 37 drehfest angeordnet sind. Die jeweils zugehörigen Zahnriemenscheiben sind dagegen drehbar auf einer Welle 38 gelagert, die in dem Gehäuse 34 abgestützt ist. Wird das Gehäuse 34 durch die Rotorwelle 14 des Stellmotors 11 angetrieben, wird die Welle 38 um das Eingangsglied 36 gedreht, und es wird in dem ersten Getriebezug 32 eine Relativdrehung der ersten Übersetzungsstufe 39 gegenüber der zweiten Übersetzungsstufe 40 je nach der gewählten Übersetzung erzeugt.The two gear stages 39 and 40 of the first gear train 32 are formed by toothed belt drives, the central pulleys are rotatably mounted on the input member 36 and the output member 37. The respectively associated toothed belt pulleys, however, are rotatably mounted on a shaft 38, which is supported in the housing 34. If the housing 34 is driven by the rotor shaft 14 of the servo motor 11, the shaft 38 is rotated about the input member 36, and it is generated in the first gear 32, a relative rotation of the first gear stage 39 relative to the second gear stage 40 depending on the chosen translation.

Sowohl die Übersetzungsstufen 39 und 40 des ersten Getriebezuges 32, wie auch die Übersetzungsstufen 42 und 43 des zweiten Getriebezuges 33 können, wie dies in den Fig. 1 und 2 dargestellt ist, als Zahnriementriebe oder als Keilriementriebe ausgebildet sein. Es ist aber auch möglich, diese Übersetzungsstufen als Zahnradstufen auszulegen. Auch sind die Übersetzungen je nach Einsatzbereich der Spanneinrichtung 1 wählbar.Both the gear ratios 39 and 40 of the first gear train 32, as well as the gear ratios 42 and 43 of the second gear train 33, as shown in the Fig. 1 and 2 is shown, designed as a toothed belt drives or as V-belt drives. But it is also possible to interpret these gear ratios as gear stages. Also, the translations depending on the application of the clamping device 1 can be selected.

In den Fig. 1 und 2 ist die Spanneinrichtung 1 in unterschiedlichen Betriebsstellungen dargestellt. Fig. 1 zeigt die Spanneinrichtung 1 vor Beginn eines Spannvorganges, d.h. das Spannfutter 3 ist geöffnet, der Stellmotor 11 ist stromlos, so dass dessen Kupplungsscheibe 17 an der Bremsscheibe 18 anliegt und alle Bauteile stillgesetzt sind. Gemäß der Darstellung in Fig. 2 ist zwischen den Spannbacken 4 des Kraftspannfutters 3 ein Werkstück 10 eingespannt.In the Fig. 1 and 2 is the clamping device 1 in different operating positions shown. Fig. 1 shows the clamping device 1 before the start of a clamping operation, ie the chuck 3 is open, the servo motor 11 is de-energized, so that the clutch disc 17 rests against the brake disc 18 and all components are stopped. As shown in Fig. 2 is clamped between the clamping jaws 4 of the power chuck 3, a workpiece 10.

Soll in dem in Fig. 1 dargestellten offenen Kraftspannfutter 3 der Spanneinrichtung 1 gemäß Fig. 2 ein Werkstück 10 eingespannt werden, so sind die Spannbacken 4 radial nach innen zu verschieben. Dazu ist die Zugstange 6, die über ein Zwischenglied 6' mit den Umlenkhebeln 7 in Triebverbindung steht, nach rechts zu bewegen. Um dies bewerkstelligen zu können, ist mittels des Antriebsstranges 31 eine Relativverdrehung zwischen der angetriebenen Maschinenspindel 5 und der Glocke 22 zu erzeugen, so dass durch die Glocke 22, die über einen Getriebetrieb und einen Mitnehmer 26 mit der Zugstange 6 gekoppelt ist, diese entsprechend axial zu verschieben. Dem Stellmotor 11 ist dazu spannungsgeregelt elektrische Energie zuzuführen. Das mit der Rotorwelle 14 verbundene Gehäuse 15 wird dadurch verdreht, so dass durch die Übersetzungsstufen 39 bzw. 40 des ersten Getriebezuges 32 oder des zweiten Getriebezuges 33, je nach Auslegung, eine Drehzahldifferenz zwischen dem Eingangsglied 36 und dem Ausgangsglied 32 entsteht. Über die Übersetzungsstufe 43 des zweiten Getriebezuges 33 wird die Differenzdrehzahl gegenüber der Hohlwelle 21 auf die Glocke 22 geleitet. Die Zugstange 6 wird somit axial nach rechts verschoben. Zum Öffnen des Spannfutters 3 ist der Stellmotor 11 umzusteuern, so dass die Zugstange 6 nach links bewegt wird.Should be in the in Fig. 1 shown open power chuck 3 of the clamping device 1 according to Fig. 2 a workpiece 10 are clamped, the clamping jaws 4 are to be moved radially inwards. For this purpose, the pull rod 6, which is in driving connection via an intermediate member 6 'with the reversing levers 7, to move to the right. To accomplish this, by means of the drive train 31, a relative rotation between the driven machine spindle 5 and the bell 22 to produce, so that by the bell 22 which is coupled via a gear drive and a driver 26 with the tie rod 6, this corresponding axially to move. The servomotor 11 is to supply voltage controlled electrical energy. The connected to the rotor shaft 14 housing 15 is thereby rotated so that a speed difference between the input member 36 and the output member 32 is formed by the translation stages 39 and 40 of the first gear train 32 or the second gear train 33, depending on the design. About the translation stage 43 of the second gear train 33, the differential speed with respect to the hollow shaft 21 is directed to the bell 22. The pull rod 6 is thus displaced axially to the right. To open the chuck 3, the servo motor 11 is to be reversed, so that the pull rod 6 is moved to the left.

Um das Werkstück 10 in dem Spannfutter 3 in Spannstellung zu halten, ist in Betriebsstellung eine entsprechendes Drehmoment des Stellmotors 11 einzuleiten, das je nach der erforderlichen Spannkraft zu wählen ist. Da dieses Moment mittels eines Spannungsreglers auf einfache Weise geändert werden kann, ist ebenso die Spannkraft des Spannfutters 2 an den jeweiligen Einsatzzweck problemlos anzupassen. Auch können die beiden Getriebezüge 32 und 33 des Antriebsstranges 31 wechselseitig als Untersetzungs- bzw. als Übersetzungsgetriebe ausgelegt werden.To keep the workpiece 10 in the chuck 3 in clamping position, a corresponding torque of the servomotor 11 is to be initiated in the operating position, which is to be selected depending on the required clamping force. Since this moment can be changed easily by means of a voltage regulator, the clamping force of the chuck 2 is also easily adapted to the particular application. Also, the two gear trains 32 and 33 of the drive train 31 can be mutually interpreted as a reduction or as a transmission gear.

Bei der Ausgestaltung nach Fig. 4 ist der Glocke 22' ein Untersetzungsgetriebe 27 vorgeschaltet, so dass bei einer Relativverdrehung zwischen der Hohlwelle 21' und der Zugstange 6 diese jeweils nur geringfügig verstellt wird und demnach besonders hohe Spannkräfte zu erzeugen sind. Das als Planetenradgeriebe ausgebildete Untersetzungsgetriebe 27 ist hierbei mit der Maschinenspindel 5 und dem Eingangsglied 41 der zweiten Getriebestufe trieblich verbunden, außerdem mit der Hohlwelle 22'.In the embodiment according to Fig. 4 is the bell 22 'a reduction gear 27 upstream, so that in a relative rotation between the hollow shaft 21' and the tie rod 6, this is only slightly adjusted and therefore particularly high clamping forces are to be generated. The reduction gear 27 designed as a planetary gear drive is in this case connected to the machine spindle 5 and the input member 41 of the second gear stage, in addition to the hollow shaft 22 '.

Gemäß Figur 6 ist die Spanneinrichtung 1' zusätzlich mit einer Sicherungseinrichtung 51 sowie einer Sicherungssteuerung 61 ausgestattet. Des Weiteren ist als Stellmotor 11' ein handelsüblicher Elektromotor vorgesehen und dessen Rotorwelle 14' ist über einen Zahnriementrieb 14" mit dem Gehäuse des ersten Getriebezuges 32, der aus Zahnradstufen besteht, trieblich verbunden.According to FIG. 6, the tensioning device 1 'is additionally equipped with a safety device 51 and a safety control 61. Furthermore, as a servomotor 11 ', a commercially available electric motor is provided and its rotor shaft 14' is connected via a toothed belt drive 14 "with the housing of the first gear train 32, which consists of gear stages, drivingly connected.

Die Sicherungseinrichtung 51 besteht hierbei aus einem Sicherungsbolzen 52, der in einem mit dem Eingangsglied 41 des zweiten Getriebezuges verbundenen Zwischenstück 56 eingesetzt ist, einer Feder 53 und einem Elektromagneten 54. Bei Ausfall der Magnetkraft rastet der Sicherungsbolzen 52 durch die Kraft der Feder 53 selbsttätig in eine Ausnehmung 55 ein, die in einem weiteren an der Hohlwelle 21' befestigten Bauteil 57 eingearbeitet ist. Auf diese Weise ist die Spanneinrichtung 1' blockiert, so dass auch bei einem Stromausfall die Spannkraft aufrecht erhalten bleibt.The safety device 51 consists in this case of a safety pin 52 which is inserted in a connected to the input member 41 of the second gear train intermediate piece 56, a spring 53 and an electromagnet 54. In case of failure of the magnetic force of the safety pin 52 engages by the force of the spring 53 in automatically a recess 55, which is incorporated in a further on the hollow shaft 21 'fixed member 57. In this way, the clamping device 1 'is blocked, so that even in case of power failure, the clamping force is maintained.

Mittels der Sicherungssteuerung 61 kann in wählbaren Zeitabständen die Festigkeit einzelner oder aller Bauteile der Spanneinrichtung 1, insbesondere die Bauteile der Getriebezüge 32 und 33, überprüft werden, in dem diese für eine kurze Zeit überbeansprucht werden. Eine stets hohe Betriebssicherheit ist somit gewährleistet.By means of the securing control 61, the strength of individual or all components of the clamping device 1, in particular the components of the gear trains 32 and 33, can be checked at selectable intervals, in which they are overstressed for a short time. A high level of operational reliability is thus guaranteed.

Claims (9)

Spanneinrichtung (1) für Werkzeugmaschinen (2), die mit einem kraftbetätigten Spannfutter (3) zur Halterung eines Werkstückes (10) versehen und dessen Spannbacken (4) mittels der Spanneinrichtung (1) über eine axial verstellbare Zugstange (6) betätigbar sind, wobei die Spanneinrichtung (1) einen umschaltbaren Stellmotor (11), einem zwischen diesem und der Zugstange (6) angeordneten Antriebsstrang (31) sowie eine trieblich mit dem Stellmotor (11) gekoppelte, vorzugsweise auf einer mit der Maschinenspindel (5) verbundenen Hohlwelle (21) drehbar gelagerte Glocke (22) aufweist,
dadurch gekennzeichnet,
dass der Antriebsstrang (31) als zweiteiliger Getriebezug (32, 33) ausgebildet ist, dessen erster Teil (32) in einem Gehäuse (34) angeordnet ist, das fest mit der Rotorwelle (14) des Stellmotors (11) verbunden ist, dass das Eingangsglied (36) und das Ausgangsglied (37) des ersten Getriebezuges (32) über den zweiten Getriebezug (33) an die Glocke (22) bzw. an die Maschinenspindel (5) angeschlossen sind, und dass zur axialen Verstellung der Zugstange (6) mittels des ersten Getriebezuges (32) des Antriebsstranges (31) bei Verdrehungen des Gehäuses (34) Relativdrehungen gegenüber den Eingangsdrehrichtungen zwischen dem Eingangsglied (36) und dem Ausgangsglied (37) erzeugbar sind.Clamping device (1) for machine tools (2) provided with a power-operated chuck (3) for holding a workpiece (10) and the clamping jaws (4) by means of the clamping device (1) via an axially adjustable tie rod (6) are actuated, wherein the tensioning device (1) comprises a switchable servomotor (11), a drive train (31) arranged between the latter and the drawbar (6) and a drive shaft (11) coupled to the servomotor (11), preferably on a hollow shaft (21) connected to the machine spindle (5) ) rotatably mounted bell (22),
characterized,
in that the drive train (31) is designed as a two-part gear train (32, 33) whose first part (32) is arranged in a housing (34) fixedly connected to the rotor shaft (14) of the servomotor (11) Input member (36) and the output member (37) of the first gear train (32) via the second gear train (33) to the bell (22) or to the machine spindle (5) are connected, and that for the axial adjustment of the drawbar (6) By means of the first gear train (32) of the drive train (31) during rotation of the housing (34) relative rotations relative to the input directions of rotation between the input member (36) and the output member (37) can be generated. Spanneinrichtung nach Anspruch 1,
dadurch gekennzeichnet,
dass die beiden Getriebezüge (32, 33) des Antriebsstranges (31) wechselseitig als Untersetzungsgetriebe bzw. als Übersetzungsgetriebe ausgelegt sind.Clamping device according to claim 1,
characterized,
that the two gear trains (32, 33) of the drive train (31) are mutually designed as a reduction gear or as a transmission gear. Spanneinrichtung nach Anspruch 2,
dadurch gekennzeichnet,
dass die Übersetzungsstufen (39, 40) der beiden Getriebezüge (32, 33) des Antriebsstranges (31) durch einen Zahnriementrieb, einen Keilriementrieb oder durch Zahnradstufen gebildet sind.Clamping device according to claim 2,
characterized,
in that the gear ratios (39, 40) of the two gear trains (32, 33) of the drive train (31) are formed by a toothed belt drive, a V-belt drive or gear stages. Spanneinrichtung nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet,
dass der Stellmotor (11) als Elektromotor, vorzugsweise als Bremsankermotor oder als Hydraulikmotor ausgebildet ist, und dass dessen Stillstandsdrehmoment unmittelbar auf das Gehäuse (34) des 1. Getriebezuges (32) einwirkt.Clamping device according to one of claims 1 to 3,
characterized,
in that the servomotor (11) is designed as an electric motor, preferably as a brake armature motor or as a hydraulic motor, and that its standstill torque acts directly on the housing (34) of the first gear train (32). Spanneinrichtung nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet,
dass die Glocke (22) über einen Getriebetrieb (25) oder einen Rollenwälztrieb unmittelbar oder über Zwischenglieder (26) mit der Zugstange (6) gekoppelt ist.Clamping device according to one of claims 1 to 4,
characterized,
in that the bell (22) is coupled to the pull rod (6) directly or via intermediate links (26) via a gear mechanism (25) or a roller roller drive. Spanneinrichtung nach Anspruch 5,
dadurch gekennzeichnet,
dass die Glocke (22') über ein Untersetzungsgetriebe (21) mit dem Abtriebsglied (43) des zweiten Getriebezuges (33) trieblich verbunden ist.Clamping device according to claim 5,
characterized,
in that the bell (22 ') is drivingly connected to the output member (43) of the second gear train (33) via a reduction gear (21). Spanneinrichtung nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet,
dass die Spanneinrichtung (1) mit einer Sicherheitseinrichtung (51) versehen ist, mittels der der Antriebsstrang (31) selbsttätig verriegelbar ist.Clamping device according to one of claims 1 to 6,
characterized,
that the clamping device (1) is provided with a safety device (51) by means of the drive train (31) is automatically locked. Spanneinrichtung nach Anspruch 7,
dadurch gekennzeichnet,
dass die Sicherheitseinrichtung (51) aus an einem von zwei relativ zueinander verdrehbaren Bauteilen (21', 55) der Spanneinrichtung (1) angeordnete, entgegen der Kraft einer Feder (53) durch einen Elektromagneten (54) gehaltenen Sicherungsbolzen (52) gebildet ist, der bei Ausfall der Magnetkraft in eine an dem anderen Bauteil (21') vorgesehene Ausnehmung (55) selbsttätig einrastet.Clamping device according to claim 7,
characterized,
in that the safety device (51) is formed from a securing pin (52) held against one of two components (21 ', 55) of the tensioning device (1) that can rotate relative to one another, counter to the force of a spring (53) by an electromagnet (54), in case of failure of the magnetic force in one on the other component (21 ') provided recess (55) automatically engages. Spanneinrichtung nach einem der Ansprüche 1 bis 8,
dass die Spanneinrichtung (1) mit einer Sicherungssteuerung (61) versehen ist, mittels der in zeitlich wählbaren Abständen die Festigkeit einzelner oder aller Bauteile der Spanneinrichtung (1), insbesondere der Getriebezüge, durch kurzzeitige Überlastung überprüfbar ist.Clamping device according to one of claims 1 to 8,
in that the tensioning device (1) is provided with a securing control (61) by means of which the strength of individual or all components of the tensioning device (1), in particular of the gear trains, can be checked at short intervals by means of temporary overloading.
EP09001874A 2009-02-11 2009-02-11 Clamping device for machine tools Active EP2218531B1 (en)

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JP2010018444A JP2010184345A (en) 2009-02-11 2010-01-29 Clamping device for machine tool
US12/658,335 US20100283215A1 (en) 2009-02-11 2010-02-09 Clamping device for machine tools

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EP2769788A1 (en) * 2013-02-22 2014-08-27 Karl Hiestand Clamping device for machine tools
CN105798341A (en) * 2016-05-20 2016-07-27 常州龙腾光热科技股份有限公司 Slotting chuck
EP3127640A1 (en) * 2015-08-05 2017-02-08 MTH GbR Markus und Thomas Hiestand Clamping device

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KR101485559B1 (en) 2013-06-17 2015-01-23 이엠코리아주식회사 Verticality type numerically controlled lathe
EP2868410B1 (en) * 2013-10-30 2017-12-13 MTH GbR Markus und Thomas Hiestand Clamping device for machine tools
CN108672733B (en) * 2018-04-19 2023-11-17 中信戴卡股份有限公司 Wheel clamp

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Publication number Priority date Publication date Assignee Title
EP2769788A1 (en) * 2013-02-22 2014-08-27 Karl Hiestand Clamping device for machine tools
EP3127640A1 (en) * 2015-08-05 2017-02-08 MTH GbR Markus und Thomas Hiestand Clamping device
CN105798341A (en) * 2016-05-20 2016-07-27 常州龙腾光热科技股份有限公司 Slotting chuck
CN105798341B (en) * 2016-05-20 2018-01-02 常州龙腾光热科技股份有限公司 One kind fluting chuck

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JP2010184345A (en) 2010-08-26
US20100283215A1 (en) 2010-11-11
EP2218531B1 (en) 2012-12-05

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